Hey @saki2006 ,
We will do our best to help you out, can you answer a few questions to help figure out what’s happening.
How large is your file in mb’s when Blender crashes?
Which version of Blender are you using ?
Have you always experienced this even with older versions of Blender ?
What is your computer setup ? (GPU, CPU, RAM, OS)
Do you have other programs running while using Blender ? Even anti-virus software, if so make sure any scans or updates are scheduled when it is convenient for you and not inconveniently while you are Blendering.
My first thought is a hardware issue, make sure all drivers are up to date.
Can you share your file on Google Drive or Dropbox for example so I can see if I experience any issues, and look for any potential problems in the file.
One last thing, do you you have any add-ons enabled or anything that’s not default Blender setup, a theme for example ?